TY  - JOUR
A1  - Porȩba, Tomasz
A1  - Racioppi, Stefano
A1  - Garbarino, Gaston
A1  - Morgenroth, Wolfgang
A1  - Mezouar, Mohamed
T1  - Investigating the structural symmetrization of CsI3 at high pressures through combined X-ray diffraction experiments and theoretical analysis
T2  - Inorganic chemistry
N2  - ABSTRACT: Structural evolution of cesium triiodide at high pressures has been revealed by synchrotron single-crystal X-ray diffraction. Cesium triiodide undergoes a first-order phase transition above 1.24(3) GPa from an orthorhombic to a trigonal system. This transition is coupled with severe reorganization of the polyiodide network from a layered to three-dimensional architecture. Quantum chemical calculations show that even though the two polymorphic phases are nearly isoenergetic under ambient conditions, the PV term is decisive in stabilizing the trigonal polymorph above the transition point. Phonon calculations using a non-local correlation functional that accounts for dispersion interactions confirm that this polymorph is dynamically unstable under ambient conditions. The high-pressure behavior of crystalline CsI3 can be correlated with other alkali metal trihalides, which undergo a similar sequence of structural changes upon load.
Y1  - 2022
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/63046
SN  - 0020-1669
SN  - 1520-510X
VL  - 61
IS  - 28
SP  - 10977
EP  - 10985
PB  - American Chemical Society
CY  - Washington
ER  -